Code No. P0515: Battery Temperature Sensor System
OPERATION
- A power voltage of 5 V is applied to the battery temperature sensor output terminal from the engine-ECU connector terminal BTS.
- The power voltage is earthed to the engine-ECU connector terminal AFSE&ECBE from the battery temperature sensor connector terminal.
FUNCTION
- The battery temperature sensor converts the battery temperature into a voltage and inputs the signal to the engine-ECU.
- In response to the signal, the engine-ECU controls charging and discharging.
- The battery temperature sensor is a kind of resistor, which has characteristics to reduce its resistance as the battery temperature rises. Therefore, the sensor output voltage varies with the battery temperature, and becomes lower as the battery temperature rises.
TROUBLE JUDGEMENT
Check Condition
- Battery positive voltage is 8 - 16 V.
- 2 seconds later after the ignition switch has been in "ON" position or the engine has started up.
Judgement Criterion
- The battery temperature sensor output voltage is more than 4.88 V.
or
- The battery temperature sensor output voltage is less than 0.09 V.
FAIL-SAFE AND BACKUP FUNCTION
PROBABLE CAUSES
- Failed battery temperature sensor
- Open/short circuit or harness damage in battery temperature sensor circuit or loose connector contact
- Failed engine-ECU
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STEP 1. M.U.T.-III data list
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- Item No. 402: Battery temperature sensor
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OK: At ambient temperature (atmospheric temperature) of battery temperature sensor, or equivalent
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Q.
Is the check result normal?
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 Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions).
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 Go to Step 2.
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STEP 2. Check battery temperature sensor itself.
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- Check battery temperature sensor itself (Refer to GROUP 54A - Battery - On-vehicle Service - Battery Current Sensor Check <2200>
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Q.
Is the check result normal?
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Go to Step 3.
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Replace the battery current sensor.
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STEP 3. Voltage measurement at battery current sensor connector (BTS line).
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(1)Disconnect the connector, and measure at the wiring harness side.
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(3)Check the voltage between the battery current sensor connector (BTS line) and body earth.
OK: 4.5 - 4.9 V
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Q.
Is the check result normal?
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Go to Step 6.
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Go to Step 4.
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STEP 4. Check of open circuit and short to earth in BTS line between battery current sensor connector and engine-ECU connector.
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Q.
Is the check result normal?
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Go to Step 5.
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Repair the connector(s) or wiring harness.
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STEP 5. M.U.T.-III data list
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- Item No. 402: Battery temperature sensor
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OK: At ambient temperature (atmospheric temperature) of battery temperature sensor, or equivalent
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions).
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Replace the engine-ECU.
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STEP 6. Resistance measurement at battery current sensor connector (AFSE&ECBE line).
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Measure the resistance between the battery current sensor connector (AFSE&ECBE line) and body earth.
OK: Continuity (2 Ω or less)
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Q.
Is the check result normal?
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Go to Step 8.
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Go to Step 7.
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STEP 7. Check of open circuit and damage in AFSE&ECBE line between battery current sensor connector and engine-ECU connector.
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Q.
Is the check result normal?
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Go to Step 5.
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Repair the connector(s) or wiring harness.
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STEP 8. Check of damage in BTS line between battery current sensor connector and engine-ECU connector.
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Q.
Is the check result normal?
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Go to Step 5.
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Repair the connector(s) or wiring harness.
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